是过去完成进行时态,表示过去一段时间正在进行的动作
time to play是弹奏（乐器）的时间,加without应该是没有弹奏的时间,类似的有something to eat吃的东西等
当我可以美妙的弹奏一些东西的时候,我感到得心应手了.
I have been ( )the flute(笛）for more than 4 years.
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